. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 660 JN VEUTEBHA TE MOliPIIOLOO T. V tonor extremity, forming a postoral ciliated band, the anus lying witiiout the area enclosed by it. In front of the mouth is a trilobed region also surrounded by a band of cilia, the adoral band. In young embryos ti,. adoral and postoral bands are united at the apex, separation only suj.,,- ;ning later. In later stages two additional arms are developed at the sides of the apical lobe, which becomes like the new arms destitute
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 660 JN VEUTEBHA TE MOliPIIOLOO T. V tonor extremity, forming a postoral ciliated band, the anus lying witiiout the area enclosed by it. In front of the mouth is a trilobed region also surrounded by a band of cilia, the adoral band. In young embryos ti,. adoral and postoral bands are united at the apex, separation only suj.,,- ;ning later. In later stages two additional arms are developed at the sides of the apical lobe, which becomes like the new arms destitute of ciii i and tipi)ed wiLh a group of wartlike elevations. This form of the larvi 'i â known as the limchiolaria. ' ' '^ A peculiar process, amounting almost to a metamorphosis, occurs the translormation of the larva into the Starfish. Calcareous plates of the aboral system make their api)earance on the dorsal surface of the stomich. Fig. 256.âBtpinnatiia ow Asleracanthion (after Aoassiz) an = anus. ],,, = 'l. m = mouth. near the posterior end of the body, and oral plates on the ventral surfa. .> o. the same organ. two systems, at first rather widely 'ni gradually approach each other, and at the same time the iutonvA assume the adult form. Finally the two series of plates unite, ^ between (hem the hydroccel, a portion of the digestive tract of tlH> n.^. ""; ,J . T'^?''^ "'""^'' â¢'""^ '"â â¢"' â¢'"« obliterated, and indeed the lor half of the larva takes no part in the formation of the adult animal. but IS gradually absorbed. A highly-developed faculty for regeneration occurs in the Asteroid,;,. the disk being able to regenerate lost arms ; and an arm, with wi,i,li u small fragment of the disk is in connection, has the ;r of ing all the missing parts. Specimens of the eommeii Starfish ar," in consequence fr
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1896
